Geoege evelyh hall



G. E. HALL.

BOILER FEEDER.

(No Model.)

No. 317,532. 'Patentied May 12, 1885.

INVENTOR WITNESSES:

UNITED STATES PATENT OFFICE;

GEORGE EVELYN HALL, OF NEV YORK, N. Y.

BOILER-FEEDER.

SPECIFICATION forming part of'Letters Patent No. 317,532, dated May 12,1885.

Application filed June 21, 1884. (Yo model.)

To all whom it may concern:

Be it known that I, GEORGEEVELYN HALL, of the city, county, and State ofNew York, have invented certain new and useful Improvements inBoiler-lleeders and Means for Preventing Explosions in Steam-Boilers, ofwhich the following is a specification.

It is a well-known fact that if the pressure on the surface of ahighly-heated liquid-such as watercontained in a steam-boiler or otherclosed vessel is from any cause removed, the water will no longer remainin the form of water, but all or a large portion of it will be instantlyconverted into steam. The expansive or acting force of the steam soproduced will depend upon the volume of water present, its

temperature, and the amount of pressure which has been removed. Verymany conditions occur in practice which 'act to lessen or decrease thepressure acting on the surface of the water in the boiler. Thus, if alarge body of cold water be delivered into a boiler when the engine,which-receives its steam from the boiler, is at rest, or if the enginebe stopped immediately after the boiler has been filled and thensuddenly started, the concussive action of the steam and the agitated orviolent motion of the water within the boiler will suddenly bring to thesurface and project into the steam-space and steam a large quantity ofwater considerably below the temperature of the water previously in theboiler, and condensation will as suddenly take place, causing anexplosion. in case of extremelylowwater, or by reason of an unusualmotion of the boiler, as by the pitching of a ship, if cold water beinjected into the steam-space, a like condensation of the steam willoccur,producing a similar result.

My invention relates to the means employed for insuringthat thefeed-water supplied to the boiler shall be always delivered at its lowerportion and out of possible contact with the steam-spaces and steam; andit consists in providing a longitudinally-arranged pipe or pipes bentupon itself or themselves to form parallel arms,one of which arms isperforated with a large number of small holes, oris provided with alarge number of jet-pipes arranged in or along the under surface of theparallel arm, the distribution of the holes or jets being such that thelarger number are located immediately over that portion of the bottomplates of the boiler which are immediately over or which act as the roofof the fire-box. By this means I am enabled, first, to partially heatthe fecd-water by its pas sage through the non-perforated arm, and toinsure a uniform distribution throughout the water in the boiler, andthus render the presence of any large body of cold water in the boilerimpossible. This arrangement also enables me to keep the lower surfaceof the boiler free from deposits or incrnstations, which usually formthereon, and are compacted by the consequent hammering or percussiveaction, as previously described, the action of the jets of water beingto wash the lower surface of the boiler and to stir up and distributeany earthy deposits which may form thereon. It also acts to increase thecir oulation of the water, and the earthy matter will either be kept insolution or deposited by the upward flow of the water and steam on thesides or upper part of the shell where it can do no harm.

In the accompanying drawings, forming a part of thisspecification,similar letters of reference indicate like parts, inwhich- Figure 1 is a central longitudinal section. Fig. 2 is a erosssection on the line :0 .r of Fig. 1. Fig. 3 is a view,partially inhorizontal section, of the tube for supplying the feed-water.

In the drawings, A represents a steam-boiler, which may be of anyapproved design, and provided with fire-fines B B.

O C C are tubes or pipes,through which the steam is conveyed from theboiler. The said pipes are provided with openings or perforations D, thearrangement and particular de scription of which I have fully describedand claimed in a previous application filed by me April 19, 1884.

H is the steam-dome, and I the steanrexit pipe.

L represents the feedpipe, which may be of any desired diameter, andformed of the two tubes M M, arranged longitudinally along the lowerportion of the boiler and parallel to each other,and joined together atone end to form a continuous sinuous passage. The tube M is attached tothe end of the boiler at 0, so as to be brought in contact with the pipefrom the source of watersn pply. The point where the Ton n veyed to theboiler.

, forated, being a simple continuous tube,whicl1 and so arranged as todistribute the streams of wvater on the lower surface of the boiler. Iprefer to locate the greatest number of 0pen ings or orifices over thatportion of the boiler under which the fire-box is located, and thenumber and size of said openings or orifices should be such that the sumof their areas shall be equal or slightly greater than the area of thepassage through which the water is con- The tube M is not perhas for itsobject to convey the cold water injected into theboiler through the hotwaterin the boiler, and thereby raise its temperature before it isdelivered into the boiler through the perforations N in the tube M.

I would have it understood that I do not limit myself to the number ofunperforated arms or tubes in which the water is carried to be heated;neither do I limit myself to the number of perforated arms through whichthe water is delivered into the boiler.

The subject-matter claimed in this present case is limited to thatparticularly recited in the following claims, and I here disclaim infavor of my prior application filed April 19, 1884, any and allpatentable subject-matter common to said application and this presentcase which is not specifically claimed herein.

and adapted to deliver water in downwardlyprojecting jets and in varyingquantities over the. lower surface of the boiler.

2. The combination,with a steam-boiler,of a feed-water pipe or pipesarranged in the lower part of said boiler and below the lowestwaterlevel, said pipes bent to form parallel arms, the under side of oneof which is perforated orprovided with small jet-pipes, the sum of y thearea of the said perforations or openings in jet-pipes, being slightlygreater than the area of the pipe or passage through which the water isconveyed to the boiler.

3. The combination,with asteam-boiler,of a feed-water pipe arrangedwithin the lower part of said boiler, said pipe formed of two armsarranged parallel to each other, one of which is perforated upon itslower side in such a manner that the number of perforations shall begreatest over that portion of the boiler that is located over thefire-box, substantially as described.

GEO. EVELYN HALL.

\Vitnesses:

GEO. H. Bmrrmrm, A. E. SEXTON.

